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Original question:

TCAN1044V-Q1: Test condition of I/O supply current in normal mode

TCAN1044AEV-Q1: RXD pin pulled to VCC, not VIO

Richard Morrison
Prodigy 10 points
Part Number: TCAN1044AEV-Q1

Tool/software:

When testing with VCC = 5V, VIO = 3.3V, I have observed the RXD pin erranously being pulled to 5V. I have 10k pullups to 3V3 on each line. Is it possible this is a hardware fault with the IC?

  • 0
    TI__Guru 50236 points

    Hi Richard,

    RXD is referenced to VIO and should not observe otherwise if TXD is also 3.3 V.

    It can be IC related if concerns with schematic. You may further confirm if TXD also observes 5 V. If so, supply to VIO may in fact be unstable or TXD's input is 5 V and forcing RXD to 5V. For additional feedback, please help share schematic and waveforms showing VCC, VIO, TXD, RXD, CANH and CANL, thanks.

    Best Regards.

    Michael.

  • 0 in reply to Michael Ikwuyum
    Prodigy 10 points

    I will take some scope shots tomorrow, but from my observations TXD was not affected, only RXD.